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Nanjo Lab
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The lab conducts experimental particle physics, exploring the properties of elementary particles with huge accelerators and detectors.
AboutAbout the lab
Probing the behavior of elementary particles with accelerators
The lab aims to elucidate the properties of elementary particles using huge particle accelerators and huge particle detectors.
In the KOTO experiment at J-PARC, the lab studies the rare decay of the neutral kaon, and in the ATLAS experiment at CERN, it studies the properties of the Higgs boson.
In the first semester, fourth-year undergraduates learn how to use measurement instruments and analyze data by measuring the muon lifetime, and from the second semester they work on their graduation research experiments.
From the master's program onward, students are assigned to individual experiment groups.
Key terms
- Elementary particle
- Particles even smaller than protons and neutrons, such as quarks and electrons. They are understood to be the smallest units that make up matter.
- Neutral kaon (neutral K meson)
- The particle whose rare decay the KOTO experiment searches for.
- Higgs boson
- A particle regarded as the origin of the mass of elementary particles. It was discovered in 2012.
NewsLab news
A master's student received the ITk Management Award for Outstanding Contribution by an Undergraduate
A master's student received the Outstanding Presentation Award at the 9th Particle Physics Computing Summer School
A doctoral student received the FY2025 Osaka University Outstanding Research Award for Female Graduate Students
Prof. Nanjo, Associate Professor Masubuchi, and Assistant Professor Hirose received the Breakthrough Prize in Fundamental Physics as members of the ATLAS experiment team
Results of the KL→π0νν search using the KOTO 2021 data have been released
ResearchResearch themes
The lab studies the properties of elementary particles and searches for unknown particles by accelerating particles to nearly the speed of light and colliding them with each other or with fixed targets. Making use of the fact that elementary particles with mass can be created from energy, the lab carries out its research with accelerators and detectors.
*Illustrative imageKOTO Experiment: Rare Decay of the Neutral Kaon
The lab searches for the rare decay of the neutral kaon, KL→π0νν, aiming to discover new physics that could help answer the question of why the world is made up only of matter. The Osaka University group has contributed to integrating the data acquisition system and constructing the CsI electromagnetic calorimeter, and also studies event selection using GPUs.
*Illustrative imageATLAS Experiment: The Higgs Boson and New Particles
The ATLAS experiment uses the LHC, the world's largest circular accelerator, to make precision measurements of the Higgs boson, discovered in 2012, and to search for supersymmetric particles that could lead to an understanding of dark matter. The Osaka group develops semiconductor detectors for the inner tracking detector.
MembersFaculty
The lab's members consist of faculty, Project Researchers, Visiting Researchers, doctoral, master's, and undergraduate students, and secretaries.As of 2026
- ProfessorHajime Nanjo
- Associate ProfessorTatsuya Masubuchi
- Assistant ProfessorMinoru Hirose
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “ATLAS CERN” Aruminska / CC BY-SA 4.0 (cropped)
- KOTO Experiment: Rare Decay of the Neutral Kaon: “J-PARC Main Ring accelerator RF Cavity” Kestrel / CC BY-SA 4.0 (cropped)
- ATLAS Experiment: The Higgs Boson and New Particles: “Large hadron collider's atlas detector” Spongelab.Community / CC BY-SA 3.0 (cropped)
- Related lab (
青木グループ（素粒子実験） ): “Argus Detector at DESY 2015” Aleksander Mielczarek / CC BY-SA 4.0 (cropped)
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